Built stroked H motor, runs good but only has 25lb oil pressure when cold,.. when warmed up goes to about 5 when idling. It does go to 20 when u rev it up. Could this just be weak pump or something else I should look into? Thanks

If your bearings were clearanced, it should hold 25 plus at idle. The pumps can wear (usually gear wear into the end plate. it can be ground flat, and clearanced to .001 to .0005". The cam bearings could need attention, were they replaced? Ga;;ery plug leaks are also possible if it was boiled out.
The last thing on my list would be weight of oil I would use an oil like 20 - 50 Kendahl, or Other racing oil. Jim

Didn't clearance bearings, just got new ones for the tractor and installed them. Took pump apart and sanded wear off plate. It carries 50lb pressure when first started then drops off after time. Has new cam bearings in it too. Got 30 weight oil in it to break in motor. Thinking of running synthetic oil or 15-40 oil, haven't decided on it yet. Thanks

The stroker crank had to be welded up on an eccentric, then ground round at a greater stroke. My best guess is the diameter might need to be checked with Plastigauge. With the pump serviced, the only things left are the relief valve in the pump, and the bearings in the lower end. Both require removal of the pan to assess. For new it is way low. Did you check the accuracy of the gauge? Jim

Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We have the parts you need to repair your tractor. We are a Company you can trust and have generous return policies! Shop Online Today or call our friendly sales staff toll free (800) 853-2651.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.